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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>课程表</title>
    <style type="text/css">
        thead {color: red;}
        tbody {color: blue;}
        tfoot {color:chartreuse;}
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<body>
    <table border="1px" align="center">
        <thead>
            <tr>
                <th colspan="8">课程表</th>
            </tr>
            <tr>
                <th>时间</th>
                <th>星期一</th>
                <th>星期二</th>
                <th>星期三</th>
                <th>星期四</th>
                <th>星期五</th>
                <th>星期六</th>
                <th>星期日</th>
            </tr>
        </thead>
        <tbody>
            <tr>
                <th rowspan="4">上午</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
            </tr>
            <tr>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
            </tr>
            <tr>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
            </tr>
            <tr>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
            </tr>
            <tr>
                <th rowspan="4">下午</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
            </tr>
            <tr>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
            </tr>
            <tr>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
            </tr>
            <tr >
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
                <th>xx</th>
            </tr>
        </tbody>
        <tfoot>
            <tr>
                <th colspan="8">自2020.11.1日执行</th>
            </tr>
        </tfoot>
    </table>
</body>
</html>